CA1100186A - Needle type non-destructive metal inspection probe - Google Patents
Needle type non-destructive metal inspection probeInfo
- Publication number
- CA1100186A CA1100186A CA349,374A CA349374A CA1100186A CA 1100186 A CA1100186 A CA 1100186A CA 349374 A CA349374 A CA 349374A CA 1100186 A CA1100186 A CA 1100186A
- Authority
- CA
- Canada
- Prior art keywords
- needle
- inspection
- exciting
- cores
- probe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides a needle type non-des-tructive metal inspection probe of the differential type for detecting flaws in a material to be inspected, comprising at least one pair of inspection needle cores having first conductors respectively wound around each needle, a set of exciting needle cores having a second conductor wound on the outer sides of the exciting needles and a core holder for holding the set of exciting needle cores and the pair of inspection needle cores.
The present invention provides a needle type non-des-tructive metal inspection probe of the differential type for detecting flaws in a material to be inspected, comprising at least one pair of inspection needle cores having first conductors respectively wound around each needle, a set of exciting needle cores having a second conductor wound on the outer sides of the exciting needles and a core holder for holding the set of exciting needle cores and the pair of inspection needle cores.
Description
~ 3~
This invention rela-tes generally to a non-destructive metal inspection apparatus and more particularly to a needle type non-destructive metal inspection probe adapted to be used in the inspection apparatus for detecting flaws in the material to be inspected.
This application is a divisional application of copending application No. 264,900 filed November 4, 1976.
Conventionally, there have been studied various kinds of non-destructive type metal inspection methods and apparatus for thesame. This prior art can be classified into a Roentgen or X-ray inspection method, an ultrasonic flaw detection method and a magnetic flaw detection method. Further the magnetic ~law detection method is divided into a magnetized power inspection method using magnetized iron powder to be sprayed on the metal and an eddy current inspection method inducing alternating current magnetic field in the metal. Especially, the eddy current type metallic flaw inspection apparatus of the prior art re~uires a strong and large-sized magnetizing apparatus, so that it is laborious and uneconomical to carry and handle the flaw inspection 2Q .apparatus and perform the inspection. Further, the material to be inspected by the eddy current type apparatus is limited to products made of non-magnetic material.
In case that the eddy current type metallic flaw inspection method and the apparatus therefore and applied to a ~ :
ferro-magnetic product s~ch as a steel plate of a steel tuhe, stress-strain and magnetism diffusion is apt to be generated along the surface of the product, so that the material of the product must be fully magnetized in order to inspect the product effectively and precisely.
That is to say, in order to infiltrate alternating magnetic field into an inner portion of the ferromagnetic material to be inspected, it is necessary to fully magnetize a disturhed magnetic field in the material or effectively arrange in order the molecules in the material by ~assing a strong direct current magnetism through the material.
The present invention overcomes the above-mentioned probiems involved in the conventional technique by providing a mechanism which is developed in order to effectively detect any flaws in the material of the product.
In copending application No. 264,900 there is disclosed and claimed a needle type non~destructive metal inspection probe comprising an outer tubular member having a central through hole of a larger diameter, an inner tubular mçmber having a central through hole of a smaller diameter, each of the outer and inner tubular members respectively having a plain land por-tion at its rear end, a grooved land portion at its front end and an intermediate caved portion, said grooved land portions respectively having a plurality of grooves formed therein and arranged circumferencially and longitudinally therein, and an inspection needle core having a first conductor wound thereon and positioned within said central through hole formed in said inner tubular member, a first set of plural exciting needle cores respectively positioned in said grooves of said inner tubular member and having a second conductor wound thereon, a second set of plural exciting needle cores respectively positioned in said longitudinal grooves of said outer tubular member and having another second conductor wound thereon, said first conduc-tor being connectable to an AC power source to detect primarily wall thickness changes, said second conductors being connectable to a DC power source to induce eddy current in the material to be inspected and to magnetize it, and a cylindrical case contain-ing said outer and inner tubular members.
According to the present invention there is provideda needle type non-destructive metal inspection probe of the differential type for detecting flaws in a material to be inspected, comprising at least one pair of inspection needle cores having first conductors respectively wound around each needle a set of exciting needle cores having a secon~ conductor wound on the outer sides of the exciting needles and a core holder for holding the set of exciting needle cores and the pair of inspection needle cores.
The needle type non-destructive metal inspection probe -of copending application No. 264,900 is called absolute type and emplo~ed primarily to determine the thickness of steel plate and wall of steel pipe.
According to -the present invention there is provided a needle type inspection probe which has at least a pair of inspection needle cores having first conductors respectively wound around each needle, a set of exciting needle cores having a second conductor wound on the outer sides of the exciting needles, a core holder, of a shape such as ellipse in section,
This invention rela-tes generally to a non-destructive metal inspection apparatus and more particularly to a needle type non-destructive metal inspection probe adapted to be used in the inspection apparatus for detecting flaws in the material to be inspected.
This application is a divisional application of copending application No. 264,900 filed November 4, 1976.
Conventionally, there have been studied various kinds of non-destructive type metal inspection methods and apparatus for thesame. This prior art can be classified into a Roentgen or X-ray inspection method, an ultrasonic flaw detection method and a magnetic flaw detection method. Further the magnetic ~law detection method is divided into a magnetized power inspection method using magnetized iron powder to be sprayed on the metal and an eddy current inspection method inducing alternating current magnetic field in the metal. Especially, the eddy current type metallic flaw inspection apparatus of the prior art re~uires a strong and large-sized magnetizing apparatus, so that it is laborious and uneconomical to carry and handle the flaw inspection 2Q .apparatus and perform the inspection. Further, the material to be inspected by the eddy current type apparatus is limited to products made of non-magnetic material.
In case that the eddy current type metallic flaw inspection method and the apparatus therefore and applied to a ~ :
ferro-magnetic product s~ch as a steel plate of a steel tuhe, stress-strain and magnetism diffusion is apt to be generated along the surface of the product, so that the material of the product must be fully magnetized in order to inspect the product effectively and precisely.
That is to say, in order to infiltrate alternating magnetic field into an inner portion of the ferromagnetic material to be inspected, it is necessary to fully magnetize a disturhed magnetic field in the material or effectively arrange in order the molecules in the material by ~assing a strong direct current magnetism through the material.
The present invention overcomes the above-mentioned probiems involved in the conventional technique by providing a mechanism which is developed in order to effectively detect any flaws in the material of the product.
In copending application No. 264,900 there is disclosed and claimed a needle type non~destructive metal inspection probe comprising an outer tubular member having a central through hole of a larger diameter, an inner tubular mçmber having a central through hole of a smaller diameter, each of the outer and inner tubular members respectively having a plain land por-tion at its rear end, a grooved land portion at its front end and an intermediate caved portion, said grooved land portions respectively having a plurality of grooves formed therein and arranged circumferencially and longitudinally therein, and an inspection needle core having a first conductor wound thereon and positioned within said central through hole formed in said inner tubular member, a first set of plural exciting needle cores respectively positioned in said grooves of said inner tubular member and having a second conductor wound thereon, a second set of plural exciting needle cores respectively positioned in said longitudinal grooves of said outer tubular member and having another second conductor wound thereon, said first conduc-tor being connectable to an AC power source to detect primarily wall thickness changes, said second conductors being connectable to a DC power source to induce eddy current in the material to be inspected and to magnetize it, and a cylindrical case contain-ing said outer and inner tubular members.
According to the present invention there is provideda needle type non-destructive metal inspection probe of the differential type for detecting flaws in a material to be inspected, comprising at least one pair of inspection needle cores having first conductors respectively wound around each needle a set of exciting needle cores having a secon~ conductor wound on the outer sides of the exciting needles and a core holder for holding the set of exciting needle cores and the pair of inspection needle cores.
The needle type non-destructive metal inspection probe -of copending application No. 264,900 is called absolute type and emplo~ed primarily to determine the thickness of steel plate and wall of steel pipe.
According to -the present invention there is provided a needle type inspection probe which has at least a pair of inspection needle cores having first conductors respectively wound around each needle, a set of exciting needle cores having a second conductor wound on the outer sides of the exciting needles, a core holder, of a shape such as ellipse in section,
2~ for holding the set of exciting needlé cores and the pair of inspection needle cores.
The probe of the present invention is called di~feren-tial type and employed primarily to detect a flaw in a steel or ferromagnetic material.
It will be apparent from the foregoing description that when the metal inspection apparatus according to the present invention is used, high voltage source and a large-scale electric apparatus are not required and an infiltration degree of the flux emitted from these needle cores is large, so that even if~the inspection probe of inspection apparatus is separated considerably away from the product to be inspected, the purpose for inspecting the product can be completely accomplished.
. . .
.. . .... . . . . . .
.8~ `
Consequently, even though this product is heated at high tempera-ture in order to arrange in order the disturbed magnetic field of the inside of the material, such phenomena do not happen that the inspection apparatus is subjected to a damage due to high temperature and operators suffer from burns.
As apparent from the above description, the present invention provides a mech~nism ofmuch greater excellence in effectiveness than the conventional eddy current metallic flaw detector, so that it seems that the present invention contributes greatly to the industrial fields.
The present invention thus provides a needle type non-destructive metal inspection probe having a very simple structure and an excellent operational effect.
The present invention also provides a non-destruckive metal inspection probe easy in carrying and adapted to function efficiently and effectively especially to an iron plate or a pipe of metal such as ferromagnetic materials;
The present invention still further provides a metal inspection probe adapted to infiltrate a flux focusingly intD an internal portion of a metal product to be inspected by using needles around which coils are wound.
The present invention also provides a very economic and convenient metal inspection probe adapted to be used in a dual-typed output indication apparatus of simple in construction and small in size.
The present invention also provides a most useful metallic flaw detection probe by providing at least one pair of inspection needle cores and at least one set of plural needle cores arranged around the inspection cores.
The present invention will be further described by way of the accompanying drawings in which:
FIG. 1 is a longitudinally sectional view showing a needle type non-destructive metal inspec~ion probe, adapted to determine the thickness of metallic products, in accord~nce wi~h copending a plication No. ~64,900, FIG. 2 is a cross sectional view of the probe shown in FIG. 1, FIG. 3 is an exploded perspective view of the probe of FIG. 1, FIG. 4 is a perspective view of a needle type non-destructive metal inspection probe, adapted to defect flaws inthe material of metallic products according to one embodiment of the present invention, FIG. 5 ~A) shows a chart of wall thickness change indication obtained by the absolute type metal inspection probe of copending application No. 264,900, FIG. 5(B) shows a chart of flaw detect.ion indicating the resulting data obtained by the embodiment of one differential type metal inspection probe, and, FIG. 6 is a block diagram of electric circuit of dual-typed output indication apparatus to which the absolute typeand differential type metal inspection probes are operatively connected.
Referring to FIGS. 1 to 3 an absolute type wall .thickness determination probe of a needle type non~destructive metal inspection probe, as shown in FIGS. 1 and 2, contain~ an outer tubular member 1, and inner member 2 inserted into the outer tubular member 1. On a center portion of the inner member, a through-hole 9 is opened, through which an insp~!ction or detecting needle core has a winding wire around the needle and connected to an AC power source of so small as 0.003 volt.
In the absolute type wall thickness determinationlprobe, the exci.ting system for exciting and magne~izing the material of product to be inspected in order to arrange in order the magnetic domains therein consists oE an inner tubular member and an outer tubular member respectively having a set of exciting needle cores buried therein. As apparently shown in FIG. 3, tubular member 2 has a plain land portion at its rear end, a grooved land portion at its front end, and an intermediate caved portion formed between them, The front land portion has a number of grooves formed therein so as to extend longitudinally on the land portion from a side to another side. A primary set of exciting needle core are so placed on the bottom o~ grooves as to extend longitudinally along the length of the front land portion. The length of the exciting needle core respectively are determined so as to contact its base or thick end with the front side of the rear plain land portion and to place its pointed end at the ~ront side of the grooved land portion.
In order to securely hold the primary set of plural exciting needle within the respective groove and on the bottom of intermediate caved portion, a second conductor is wound around the set of needle so as to contact with outer sides of the needles from a front side of the plain land portion to a rear side of the grooved land portion. The wound number of the conductor is so determined as to effectively function the absolute type probe.
Generally speaking, there is no difference between the inner tubular member 2 and the outer tubular member 1 in shape, in construction and consequently in function, except for the size. Another second conductor is wound around the set of ~ exciting needles respectively positioned in the grooves of the outer tubular member 1. The second conductors each applied to the intermediate caved portions respectively formed in the inner and outer tubular members 1 and 2 are electrically connected to ~6 ' ~ ' ' . , , . :
, a DC power source of about 0.003 V. As clearly understood from the drawings of FIGS. 1-3, the inner tubular member 2 is adapted to be inserted into the central through-hole of the outer tubular member 1. The outer diameter of the inner tubular member 2 corre5pond5 to the inner diameter of the outer tubular member 1 and consequently the former is closely fitted into the latter.
The length of the inner tubular member is the same as that of the outer tubular member, and, in assembling, the front edges of both the tubular members are almost matched or levelled to each other.
The differential type flaw detec~ion ~robe of Fig. 4 has a body member 1 corresponding to the outer tubular member 1 of theabsolute type wall thickness determination probe in function and shape. The differential type detection probe has a front land and a rear plain land portion. They ar~ separated from each other by an intermediate caved portion formed between them. On the outer wall of the front land portion, a plurality of grooves 4 are formed so as to be deepened generally toward the central portion of the front land portion and extend longitudinally from a fron~ edge of the land portion to its rear edge.
In the central portion of the fron~ grooved land portion, three pairs of through holes 9 through which six detecting needles are inserted and so positioned as that the pointed end of the needles is level with the front surface of ~he grooved land portion or set back for a small distance. Both the needles in any pair of the detecting needles are arranged along the running direct`,ion of the differential type non-de,structive metal inspection probe when applied on the surface of the material to be inspected.
So that, time lag is occurred in detecting operation of the needle and the resulting graph shows in FIG. 5 (B) is ohtained. The detecting needles to be inserted in the through-holes 9 have respectively a primary conductor connected to the AC power o~
about 0.03 V. In manufacturing of the probe, six primary con---7~
ductors are previously wound on the detecting needles and then the resulting detecting needle coils are inserted into the through-holes 9.
In the plural grooves 4 formed in the fronk land portion, a plurality of e~citing needles are inserted and held in position by means of a secondary conductor wound around the end portion of the exciting needles, which are positioned on the coil bobbin 3. The secondary conductor is electrically connected to the DC power source of about 0.003 V.
According to the ~resent invention, 1:he absolute ty~e metal inspection probe of copending application No. 264,900, and the differential type metal inspection probe of the present invention are effectively and conveniently operated when they are electrically connected, to the dual-typed output indication apparatus having an electric circuit shown in E~IG. 6. As clearly shown in FIG. 6, the absolute type probe and the differential type probe axe electrically changed over by an A - D switch and other electric parts such as a balancer, a tuning amplifier, a modulator are uséd as a common function parts of both the probes.
The DC stabilizer is connected to the parts necessary to be electrically stabilized. The dual-typed output indication apparatus is manufactured by assembling various conventional electric parts.
The resulting data of changing of wall thickness of metallic material is shown in the osciloscope installed in the indication apparatus. The data is recorded in a pen-writing oscilograph recorder in a form of curved line graph of FIGS. 5 (A) and (B). Also, the resulting data can be indicated in a diyital display device. ~Ihe oscilograph recorder and the digital display device are driven by a DC amplifier connected to them.
. . ' : ~ . ' . .
~ ccording to the present invention, the needle ty~e non-destructive metal inspection probe has generally a standard frequency range including 4 hz and 16 hz. The proper frequency is selected according to the material to be inspected and the wall thickness.
The inspection probe employs very thin needle as detection cores and exciting cores. Consequently, a small and low-power source is sufficient to effectively operate the detect-ion cores and the exciting cores and, by reason of small and lower electric power and employment of thin needle used for this needle cores, the magnetic flux penetrates in depth.
In the preferred embodiments, the respective needle has a diameter of about 0.25 mm, a length of about 40 mm and a pointed end. The whole weight of the probe is only about 100 g.
The probe of the present invention is called di~feren-tial type and employed primarily to detect a flaw in a steel or ferromagnetic material.
It will be apparent from the foregoing description that when the metal inspection apparatus according to the present invention is used, high voltage source and a large-scale electric apparatus are not required and an infiltration degree of the flux emitted from these needle cores is large, so that even if~the inspection probe of inspection apparatus is separated considerably away from the product to be inspected, the purpose for inspecting the product can be completely accomplished.
. . .
.. . .... . . . . . .
.8~ `
Consequently, even though this product is heated at high tempera-ture in order to arrange in order the disturbed magnetic field of the inside of the material, such phenomena do not happen that the inspection apparatus is subjected to a damage due to high temperature and operators suffer from burns.
As apparent from the above description, the present invention provides a mech~nism ofmuch greater excellence in effectiveness than the conventional eddy current metallic flaw detector, so that it seems that the present invention contributes greatly to the industrial fields.
The present invention thus provides a needle type non-destructive metal inspection probe having a very simple structure and an excellent operational effect.
The present invention also provides a non-destruckive metal inspection probe easy in carrying and adapted to function efficiently and effectively especially to an iron plate or a pipe of metal such as ferromagnetic materials;
The present invention still further provides a metal inspection probe adapted to infiltrate a flux focusingly intD an internal portion of a metal product to be inspected by using needles around which coils are wound.
The present invention also provides a very economic and convenient metal inspection probe adapted to be used in a dual-typed output indication apparatus of simple in construction and small in size.
The present invention also provides a most useful metallic flaw detection probe by providing at least one pair of inspection needle cores and at least one set of plural needle cores arranged around the inspection cores.
The present invention will be further described by way of the accompanying drawings in which:
FIG. 1 is a longitudinally sectional view showing a needle type non-destructive metal inspec~ion probe, adapted to determine the thickness of metallic products, in accord~nce wi~h copending a plication No. ~64,900, FIG. 2 is a cross sectional view of the probe shown in FIG. 1, FIG. 3 is an exploded perspective view of the probe of FIG. 1, FIG. 4 is a perspective view of a needle type non-destructive metal inspection probe, adapted to defect flaws inthe material of metallic products according to one embodiment of the present invention, FIG. 5 ~A) shows a chart of wall thickness change indication obtained by the absolute type metal inspection probe of copending application No. 264,900, FIG. 5(B) shows a chart of flaw detect.ion indicating the resulting data obtained by the embodiment of one differential type metal inspection probe, and, FIG. 6 is a block diagram of electric circuit of dual-typed output indication apparatus to which the absolute typeand differential type metal inspection probes are operatively connected.
Referring to FIGS. 1 to 3 an absolute type wall .thickness determination probe of a needle type non~destructive metal inspection probe, as shown in FIGS. 1 and 2, contain~ an outer tubular member 1, and inner member 2 inserted into the outer tubular member 1. On a center portion of the inner member, a through-hole 9 is opened, through which an insp~!ction or detecting needle core has a winding wire around the needle and connected to an AC power source of so small as 0.003 volt.
In the absolute type wall thickness determinationlprobe, the exci.ting system for exciting and magne~izing the material of product to be inspected in order to arrange in order the magnetic domains therein consists oE an inner tubular member and an outer tubular member respectively having a set of exciting needle cores buried therein. As apparently shown in FIG. 3, tubular member 2 has a plain land portion at its rear end, a grooved land portion at its front end, and an intermediate caved portion formed between them, The front land portion has a number of grooves formed therein so as to extend longitudinally on the land portion from a side to another side. A primary set of exciting needle core are so placed on the bottom o~ grooves as to extend longitudinally along the length of the front land portion. The length of the exciting needle core respectively are determined so as to contact its base or thick end with the front side of the rear plain land portion and to place its pointed end at the ~ront side of the grooved land portion.
In order to securely hold the primary set of plural exciting needle within the respective groove and on the bottom of intermediate caved portion, a second conductor is wound around the set of needle so as to contact with outer sides of the needles from a front side of the plain land portion to a rear side of the grooved land portion. The wound number of the conductor is so determined as to effectively function the absolute type probe.
Generally speaking, there is no difference between the inner tubular member 2 and the outer tubular member 1 in shape, in construction and consequently in function, except for the size. Another second conductor is wound around the set of ~ exciting needles respectively positioned in the grooves of the outer tubular member 1. The second conductors each applied to the intermediate caved portions respectively formed in the inner and outer tubular members 1 and 2 are electrically connected to ~6 ' ~ ' ' . , , . :
, a DC power source of about 0.003 V. As clearly understood from the drawings of FIGS. 1-3, the inner tubular member 2 is adapted to be inserted into the central through-hole of the outer tubular member 1. The outer diameter of the inner tubular member 2 corre5pond5 to the inner diameter of the outer tubular member 1 and consequently the former is closely fitted into the latter.
The length of the inner tubular member is the same as that of the outer tubular member, and, in assembling, the front edges of both the tubular members are almost matched or levelled to each other.
The differential type flaw detec~ion ~robe of Fig. 4 has a body member 1 corresponding to the outer tubular member 1 of theabsolute type wall thickness determination probe in function and shape. The differential type detection probe has a front land and a rear plain land portion. They ar~ separated from each other by an intermediate caved portion formed between them. On the outer wall of the front land portion, a plurality of grooves 4 are formed so as to be deepened generally toward the central portion of the front land portion and extend longitudinally from a fron~ edge of the land portion to its rear edge.
In the central portion of the fron~ grooved land portion, three pairs of through holes 9 through which six detecting needles are inserted and so positioned as that the pointed end of the needles is level with the front surface of ~he grooved land portion or set back for a small distance. Both the needles in any pair of the detecting needles are arranged along the running direct`,ion of the differential type non-de,structive metal inspection probe when applied on the surface of the material to be inspected.
So that, time lag is occurred in detecting operation of the needle and the resulting graph shows in FIG. 5 (B) is ohtained. The detecting needles to be inserted in the through-holes 9 have respectively a primary conductor connected to the AC power o~
about 0.03 V. In manufacturing of the probe, six primary con---7~
ductors are previously wound on the detecting needles and then the resulting detecting needle coils are inserted into the through-holes 9.
In the plural grooves 4 formed in the fronk land portion, a plurality of e~citing needles are inserted and held in position by means of a secondary conductor wound around the end portion of the exciting needles, which are positioned on the coil bobbin 3. The secondary conductor is electrically connected to the DC power source of about 0.003 V.
According to the ~resent invention, 1:he absolute ty~e metal inspection probe of copending application No. 264,900, and the differential type metal inspection probe of the present invention are effectively and conveniently operated when they are electrically connected, to the dual-typed output indication apparatus having an electric circuit shown in E~IG. 6. As clearly shown in FIG. 6, the absolute type probe and the differential type probe axe electrically changed over by an A - D switch and other electric parts such as a balancer, a tuning amplifier, a modulator are uséd as a common function parts of both the probes.
The DC stabilizer is connected to the parts necessary to be electrically stabilized. The dual-typed output indication apparatus is manufactured by assembling various conventional electric parts.
The resulting data of changing of wall thickness of metallic material is shown in the osciloscope installed in the indication apparatus. The data is recorded in a pen-writing oscilograph recorder in a form of curved line graph of FIGS. 5 (A) and (B). Also, the resulting data can be indicated in a diyital display device. ~Ihe oscilograph recorder and the digital display device are driven by a DC amplifier connected to them.
. . ' : ~ . ' . .
~ ccording to the present invention, the needle ty~e non-destructive metal inspection probe has generally a standard frequency range including 4 hz and 16 hz. The proper frequency is selected according to the material to be inspected and the wall thickness.
The inspection probe employs very thin needle as detection cores and exciting cores. Consequently, a small and low-power source is sufficient to effectively operate the detect-ion cores and the exciting cores and, by reason of small and lower electric power and employment of thin needle used for this needle cores, the magnetic flux penetrates in depth.
In the preferred embodiments, the respective needle has a diameter of about 0.25 mm, a length of about 40 mm and a pointed end. The whole weight of the probe is only about 100 g.
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A needle type non-destructive metal inspection probe of the differential type for detecting flaws in a material to be inspected, comprising at least one pair of inspection needle cores having first conductors respectively wound around each needle, a set of exciting needle cores having a second conductor wound on the outer sides of the exciting needles and a core holder for holding the set of exciting needle cores and the pair of inspection needle cores.
2. A probe as claimed in claim 1, in which the core holder is an elliptical section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA349,374A CA1100186A (en) | 1976-03-26 | 1980-04-08 | Needle type non-destructive metal inspection probe |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US67097276A | 1976-03-26 | 1976-03-26 | |
| US670,972 | 1976-03-26 | ||
| CA264,900A CA1098172A (en) | 1976-03-26 | 1976-11-04 | Needle type non-destructive metal inspection probe |
| CA349,374A CA1100186A (en) | 1976-03-26 | 1980-04-08 | Needle type non-destructive metal inspection probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1100186A true CA1100186A (en) | 1981-04-28 |
Family
ID=27164746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA349,374A Expired CA1100186A (en) | 1976-03-26 | 1980-04-08 | Needle type non-destructive metal inspection probe |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1100186A (en) |
-
1980
- 1980-04-08 CA CA349,374A patent/CA1100186A/en not_active Expired
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| MKEX | Expiry |